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The inositol (1,4,5) trisphosphate 3-kinase (ITP3K) phosphorylates Ins (1,4,5) P3 to produce Ins (1,3,4,5) P4. The ITP3K substrate, InsP3, and its product, InsP4, both have the potential to regulate mast cell function. Here, we explore the effects of dominant inhibition of ITP3K upon secretory responses and Ras GTPase activation following antigenic cross-linking of the mast cell immunoreceptor, FcɛRI...
The specificity of the inositol 1,3,4,5-tetrakisphosphate binding protein purified from porcine platelets [Cullen et al. (1995) Biochem. J. 305, 139-143] was examined using all the isomers of myo-inositol tetrakisphosphate. From the relative potencies of these compounds it appears that phosphorylation of the 1, 3 and 5 positions is essential for high affinity binding, that there is some tolerance...
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